E6.1 A system has a characteristic equation s^3 + 3Ks^2 + (2 + K)s + 5 = 0. Determine the range of K for a stable system. Answer: K > 0.63 E6.2 A system has a characteristic equation s^3 + 9s^2 + 2s + 24 = 0. Using the Routh–Hurwitz criterion, show that the system is unstable.
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